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Hahaha when I read this thread that was one of my first thoughts was of a Neanderthal like facility maintenance guy that would laugh at your idea because he has a tire pressure gage. It is a neat idea though. Many of us just carry stubby gages on a service check. I think your idea would be great for automotive.

this would be very nice for checking exotic refer equipment with minute charges.
i used to work on some bizarre refer stuff, microscopes, cell splitters etc..
some of these had minute charges that even putting a shorty hose and gauges on could cause issues.

I agree to a point, but the majority will need gas added, recovered etc so that would mean another trip to get gauges with hoses.

Now, I do have a cooper multifunction that has wired xducers for gauges that I use daily, very nice unit, but rarely do I use it only.

So your patent is out, Cooper already has one and its been out for a while, I may add I have spent around 2k on it.

I put gas in all the time with my cooper mfm300. Add a MxMxquick connect tee (JB makes them) and a 6" ball valve tee to the unit. I then leave a 72" hose and a 6" ball valve hose on all my refrigerant tanks. hook the ball valve hose to the back end of tee and throttle with ball hose from tank. gas and go. could also add a ball valve hose between transducer and tee but not necessary. The tees i have are jb A-34000, shraeders in male fittings but no depresser in quick coupler.